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• W1992852837 abstract "Abstract The formation, ligand exchange reactions, and dissociation of various types of mixed ligand/metal complexes are studied in a quadrupole ion trap. The monopositive complexes are generated by ion-molecule association reactions between the polydentate organic ligands and laser-desorbed monopositive metal ions (M+) and incorporate at least one polyether or at least one pyridyl ligand bound to a transition metal ion. Ligand exchange and collisional activated dissociation (CAD) techniques are used to investigate the nature of the binding interactions and the relative binding free energies of the various ligands. There are two dominant influences on the strength of the binding interactions in the complexes. First, the number of coordination sites of each ligand and its flexibility or ability to participate in cooperative binding interactions are reflected in the relative coordination capabilities of the ligands. Second, the ability of a ligand to approach the metal ion and successfully adopt a favorable binding conformation differs greatly when the metal is already bound to one versus two ligands. For example, when the metal is bound to two pyridyl ligands, the ability of a large flexible polyether with multiple oxygen binding sites to displace even one of the pyridyl ligands is greatly reduced relative to the case when the metal is only bound to a single pyridyl ligand. In addition to these two trends, the electronic configuration of the metal ion also plays a subtle role in terms of influencing the stabilities of certain monomer (pyridyl ligand + M+) and heterodimer (pyridyl ligand + M+ + polyether) complexes. However, the nature of the metal ion does not appear to change the trends in relative binding free energies of the various ligands; it simply influences the formation of certain types of complexes based on the optimum coordination number and favored coordination geometry of the metal ion." @default.
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• W1992852837 date "1998-06-01" @default.
• W1992852837 modified "2023-09-26" @default.
• W1992852837 title "Complexation of polyethers and pyridyl ligands with monopositive transition metal ions in the gas phase" @default.
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• W1992852837 doi "https://doi.org/10.1016/s1387-3806(98)14008-3" @default.
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